<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<form method="post" action="/ly.do" enctype="multipart/form-data">
    
    <input type="text" name="a1">
    <input type="password" name="a2">

    <input type="checkbox" name="a3" value="a">
    <input type="checkbox" name="a3" value="b">
    <input type="checkbox" name="a3" value="c">

    <input type="radio" name="a4" value="r1">
    <input type="radio" name="a4" value="r2">
    <input type="radio" name="a4" value="r3">

    <select name="a5">
        <option value="">请选择</option>
        <option value="1">成都</option>
        <option value="2">德阳</option>
        <option value="3">绵阳</option>
    </select>

    <textarea name="a6">

    </textarea>

    <input type="file" name="a7">

    <button>提交</button>

</form>

</body>
</html>